drm i915 hangs on heavy io load

[Chris Wilson]

On Wed, 24 Oct 2012 09:36:59 +0900, Norbert Preining <preining at logic.at> wrote:
> Hi Dave, hi Chris,
> 
> thanks for your answers.
> 
> On Di, 23 Okt 2012, Dave Airlie wrote:
> > Does booting with i915.i915_enable_rc6=0 help?
> 
> No,booted with that, it happened again on a completely idle
> system (well, I believe completely idle, I was doing the
> dishes ;-)
> 
> [12437.995026] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
> [12437.995034] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
> [12438.000213] [drm:init_ring_common] *ERROR* failed to set render ring head to zero ctl 00000000 head 5ee06f14 tail 00000000 start 00003000
> [12438.054894] [drm:init_ring_common] *ERROR* render ring initialization failed ctl 0001f001 head 5ee06f14 tail 00000000 start 00003000
> [12439.583064] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
> [12439.583176] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring wedged!
> [12439.583182] [drm:i915_reset] *ERROR* Failed to reset chip.
> 
> New output see here:
> http://www.logic.at/people/preining/i915_error_state.gz

That has a very similar look to it, so reasonable to assume that is the
same issue.
 
> > http://cgit.freedesktop.org/~danvet/drm/commit/?h=ilk-wa-pile&id=0d5fed2de763b49bb1a90140758153481f043757
> > is the missing ingredient.
> 
> I am compiling a kernel with this patch based on current git now.
> Should I still use the above kernel cmd argument (i915...rc6=0)
> or try without it?

Without any rc6 parameter would be best. But if rc6=0 wasn't the
solution for you, then I may have identified the wrong w/a. Can I ask
you try the patches in that branch until you find one (or more perhaps)
that stabilise your system?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre